The Bible actually has a lot to say about sleep, but not much about the importance of getting enough but there many warnings about sleeping to much.

Proverbs 6:9-11 How long will you lie down, O sluggard?
When will you arise from your sleep?
“A little sleep, a little slumber,
A little folding of the hands to rest”—
Your poverty will come in like a vagabond
And your need like an armed man.

Proverbs 19:15 Laziness casts into a deep sleep,
And an idle man will suffer hunger.

Proverbs 20:13 Do not love sleep, or you will become poor;
Open your eyes, and you will be satisfied with food.

Proverbs 24:33-34 A little sleep, a little slumber,
A little folding of the hands to rest,”
Then your poverty will come as a robber
And your want like an armed man.

One of the facts of life is that if I sleep too much, I won’t fall asleep, quickly and I will wake up often. So if I don’t sleep well I choose to sleep less. Someone came up with the rule that we needed 8 hours of sleep. I can lay in bed for 8 hours but I can’t sleep for 8 hours. I will toss and turn and sleep in fits. If I sleep for 6 hours, I go right to sleep, and I don’t wake up, and I wake up rested. I know everyone is different in their sleep needs, and my point is to discover what the minimum amount of sleep is that you need and don’t sleep more than that.

It is also very beneficial to go to sleep, and wake up at the same time most days. Our body likes routine.